From: Breukel, C (cor@lumc.nl)
Date: 09/25/01-01:59:02 AM Z
Richard,
I have made 2 small (4*5) contact frames, fitted with quartz glass (..if
you have to know..;-).. I obtained them from a automatic DNA sequencer,
without going into detail, but this maschine uses a sensor to measure
fluoresence, emitted by labeled DNA after it is hit by a laser beam. The
DNA is "moved" by electrophoreses between 2 thin plates of quartz glass,
filed with a matrix)..Anyway I got a few of these broken plates, hence
the smallish contact frame size
To cut a long story short: in my inexact testings there was no apperant
speed gain between regulair glass and quartz glass for Cyanotype and Zia
type..
Best,
Cor
Richard Knoppow wrote:
>
> At 06:11 PM 09/24/2001 -0600, you wrote:
> >The only UV clear "glass" is made from quartz vs silica. The green color is
> >Iron in the glass. It is possible to get Iron free glass that in either not
> >green or much lighter green as seen from the edge.
> >
> >As for quartz glass ???? in large sizes
> >
> I am aware of the special "glass" made from fused quartz. This is regular
> glass either without so much iron in it or somehow decolorized. There are
> optical glasses which are essentially clear but would be exceedingly
> expensive if made into a sheet. This is something else and I am not even
> sure it has any better near UV transmission. however, the dark green color
> of regular window glass, which even looks green when set on a sheet of
> paper, must have rather strongeg absorption of UV than a glass without a
> visible tint.
> ----
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@ix.netcom.com
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